Fastening device.



UNTTED vSTATES PATENT OFFICE.

JOHN FRANCIS BOORAEM, 0F GREENWICH, CONNECTICUT, AND GABRIEL ROHHER, OF RIDGEFIELD PABX, NEW JERSEY, ASSIGNORS TO THE BOORAEM & BOHMEB PATENT COMPANY, A CORPORATION 0F NEW YORK.

FASTENINc DEVICE.

Specification of Letters Patent.

Patented Dec.`8, 1914.

Application led December 18, P912. Serial No. 787,483.

To ell 'whom it may con-cem Be it known 'that we, JOHN FRANCIS BoonAnM and GABRIEL E. Ror'rMnn, both citizens of the United States, the former a resident of Greenwich, in the county of Fairfield and State 'of Connecticut, and the Vlatter a resident of Ridgefield Park, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Fastening Devices, of which the following is a spcciication.

This invention relates to fastening-devices, and more particularly to that kind used for fastening carpets, rugs, etc., to metal or stone or concrete i'oors and stairways.

'ihe object of the invention is to provide a s'irnple and convenient fastening-device which may lbe-'readily and firmly secured in metal or stone or concrete, and to which a carpet or rug may be readily fastened by means of nails or suitable pinTscrews or other means.

For this purpose our invention consists of a fastening-device having a collapsible portion, and an opening in the collapsible portieri to enable the same to be readily collapsed and the cross-section of the lhole correspondingly reduced, so as to aord friction to the entering nail or pin.

in the accompanying drawings, Figure l shows in vertical section a fastening-device embodying the invention, in its condition before insertion into a hole in stone, metal or concrete, Fig. 2 is a similar section showing the fastening-device in position in a hole in stone, rnetal or concrete, before insertion of the fastening nail. Fig. 3 shows the device in like vertical section in fastening position with a carpet or rug secured thereto by a nail, Fig. i is a side view of the lniproved device, with the stone shown in ec'tion, and showing the device in a position iiniiar to 'that of Fie. 3, with the nail seured therein, Fig. 5 .is a horizontal section of another embodiment of the invention b ving vertical rib instead of horizontal s, and Fig. 'i3 is a jle-eievation of the de vice of 'position in a hole.

Similar characters o' reference indicate corresponding throughout the views.

elbring to drawings, and more particularly to Figs. l 'to le thereof, our improved fastening-device consists of a plug ofjsu'ita'ble material such as lead or alloy, which has a main-portion of diameter substantially7 the size of the hole into which it is to be inserted. 'lhe device has an extending iange 11 adapted to seat on the upper face oi the stone 'or metal, and a hole l2 is provided vertically and preferably centrally in the device.l Between the flange ll and the main-portion 10 a collapsible portion 13 is provided, having a serles of cut-out portions or grooves 14. The material 15 of the bodyportion remaining near the cut-out portions is considerably re duced in resisting qualities at this part of the device. The object of this reduction in resisting qualities is clearly shown in Fig.

2, Where the serratio'ns are brought together bycompression. This results 'from the insertion of the main-portion 10 into the hole i6 of `the stone, :metal or concrete floor 17. The overcoming of the friction during the insertion of the device requires considerable pressure to be exerted on the top 18 of the device, and this pressure on the one hand, and the friction resisting the insertion at the point i9 on the other hand, as also abutment of the bottom of the main-portion l0 with the bottom oi" the hole, causes the material at 15 to be compressed, and hence the serrati'ons brought close to each other as shown. As the hole 12 permits the ngaterial at 15 to move inwardly, the Walls forming the hole 12 are brought into curved shape as shown at 20, the intermediate part of the hole l2 being thereby reduced in cross-section in respect to that of the upper part of the hole and the lower part of the hole. Hence when a nail or other fastening means 2l is inserted into the hole 12 with the central part of the hole 12 narrow as shown at 20, the nail has to overcome the friction and secures thereby a iii-ni hold in 'the fastening-device. By the downward pressure exerted by the nail 'the material at 15 is pressed outwardly and thereby serrations 13 against tie Walls of 'the hole ii o" stone, and a very tight it is secured. 3 4i the 'nail 2l holds a piece ca or rug 22 in position.

- in 5 il. serrations or ribs 25 are ver call near die top of the rresponding to the device to p rt or Figs. l to fr. @n the l part 19 oi the device f" instead horizoninsertion of the device in the stone, the ribs are bent toward each other invan irre ular mannerA and at the Asame' time the ho e or bore 26 is reduced in diameter in like manner as before described with relation to the hole 12.

The device Shown in Figs. and e is als@ provided with a flange 11, but this may be" omitted in this device a's also in the-device shown in Figs. l to 4. The hole n the stone into which the device isfinsertedmay be provided with a bottom 27 as in Figs. 2, 3 and 4, or the same may be bottomless as in Fig.V

6. The hole. 12 in the fastening device may also extend entirely through the same,in stead of being closed at the bottom as shown.

By the means proposed a very simple fastening device is provided, which may be inexpensively manufactured, and which is easily inserted for use Whenever required. We have shown two embodiments of the invention,but it is obvious that the inven- 'tion may take other forms without depart- Y main portlon and aarelatively weakened and y collapsible portion havingv external bendable circumferentially-arranged ribs, said cola compressible material, com rising aA lap-sible portion having a bore for thejinsertion of the fastening means bulged in by the 4Q collapsing of the collapsible portion.

3. An improved fastenin ydevice formed of a compressible materia., comprising a main portion, an extending flange ortion,

and a relatively weakened and vcol apsible portion at the external part thereof, said collapsible portion having a bore for the insertion of the fastening means bulged in by thecollapsing of the collapsible portion.

4. An improved fastenin device formed ofa compressible -materia comprising a main portionand a bored-out portion weakened relatively to said main portion, said weakened portion being adapted to collapse in a direction parallel to its bore, whereby the collapsin havin an extending ange portion, said bulge -in bore being adapted to receive a' fastening means.

5. Anfimproved fastening device formed of a compresslble material, comprising a main portion, and a bored-out portion weakened relatively to said main portion by'a series ofexternal circumferential indentations in the of said weakened portion e bulges 1n sai bore, said weakened portiony walls thereof, whereby said/weakened portion is ada ted to collapse in 'a direction parallel to 1ts bore, and bulge in said bore. In testimony, that weI claim the foregoing as our invention, we have signed our names 1n presence of two subscribin witnesses.

JOHN FRANCIS'OORAEM-l GABRIEL E. vROHMER. VWitnesses: l

' JOHN Mtmraen, 

